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프리스트레스트 콘크리트 합성(合性)보의 직접설계(直接設計)
김수만,Kim, Su Man 대한토목학회 1990 대한토목학회논문집 Vol.10 No.3
오늘날 프리스트레스트 콘크리트(PC) 합성보의 설계는 단면을 가정한 다음 프리스트레스 크가와 편심거리(偏心距離)를 구하는 일로 이루어 진다. 이러한 설계방법(設計方法)으로는 PC보와 철근큰크리트 슬래브로 형성(形成)된 합성단면(合成斷面)의 특성(特性)이 설계(設計)에 반영되지 못하므로 이를 반영(反映)하기 위해서는 반복설계(反復設計)를 거쳐야 한다. 이와 같은 반복설계는 시간과 인력을 요(要)하므로 비(非) 경제적(經濟的)인 설계방법이 된다. 따라서 반복설계를 피하고 직접(直接) 설계(設計)할 수 있는 개선(改善)된 설계방법의 개발(開發)이 요망(要望)된다. 이 연구(硏究)에서는 비합성단면(非合成斷面)을 직접(直接) 설계(設計)할 수 있듯이 합성단면(合成斷面)도 직접 설계할 수 있도록 개선된 설계 방법을 제안(提案)하였다. 제안(提案)된 설계방법(設計方法)을 쉽게 활용(活用)할 수 있도록 설계예(設計例)를 제시(提示)하였으며 제안된 설계방법의 신뢰성(信賴性)을 규명(糾明)하기 위해 제시된 설계예의 설계조건(設計條件)을 기(旣) 발표된 Hatcher논문의 설계조건과 동일(同一)하게 하여 설계결과(設計結果)를 비교하였다. 그 결과(結果) 이 논문에서 제안(提案)한 설계방법(設計方法)에 따른 설계결과와 Hatcher 논문의 설계결과가 잘 일치(一致)함을 확인할 수 있었다. Todays, design of composite prestressed concrete beams is carried out by calculation of the prestressing force and its eccentricity assuming the sectional properties. However the characteristics of composite section made with a precast prestressed concrete beams and reinforced concrete slab is not reflected, so iteration method has been adopted. But its methed requires much time and labor. Accordingly, an improved design method will be presented. In this study, improved design method is proposed to design composite section directly without iterative calculation. Design examples according to the proposed design method are presented for easy application and verification of its reliability and authenticity. The results match well with the Hatcher's.
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김수만,이재헌,Kim, Su-Man,Lee, Jae-Heon 한국플랜트학회 2013 플랜트 저널 Vol.9 No.1
노후 무연탄발전소를 리파워링함에 있어 현실적인 대안이 되는 시나리오별로 경제성 분석을 시행한 결과 내부수익률은 750 MW급 LNG 복합화력으로 하였을 때 2.34%, 500 MW급 유연탄 석탄화력으로 하였을 때 3.56%, 200 MW급 유동층 석탄화력으로 하였을 때 2.31%로 나타나 경제성 분석 기준으로 삼았던 할인율 7%보다 낮게 평가되어 경제적 타당성을 확보하지 못하는 것으로 평가되었다. 그러나, 현재의 전력거래시장제도가 규제위주에서 시장위주로 변화되어 경제적 타당성이 현재보다 개선되고, 전력수요 대비 공급이 부족한 상황에서 수명이 소진된 노후 무연탄발전소의 리파워링이 불가피하다면 연구된 경제성을 기초로 초기투자비가 적으며, 유휴부지 활용과 연료수급이 수월하고, $CO_2$ 배출량이 상대적으로 적은 750 MW급 LNG 복합화력으로의 리파워링이 가장 효과적인 방안이라고 제시하고자 한다. In this study, repowering scenarios are analyzed and evaluated from the economical point of view on a case by case basis. Based on the result of evaluation, the IRR indicates 2.34% on single 750 MW LNG combined cycle unit, 3.56% on 500 MW sub-bituminous PC units and 2.31% on 200 MW circulating fluidized bed combustion units, resulting in not reaching 7% rate of discount rate and being concluded uneconomical. However, proposes that it is most economical and feasible to repower power plant into 750 MW LNG combined cycle unit as long as the economic feasibility can be improved and it is necessary for old anthracite power plant to be repowered than rebuilt under the circumstances of lacking power supply.
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편집사설 : 인천항의 서비스품질이 고객만족과 경영성과에 미치는 영향
김수만 ( Sooman Kim ),최해섭 ( Haesup Choi ),김연성 ( Youn Sung Kim ),유홍성 ( Hong Sung Yoo ),유석천 ( Seuck Cheun Yoo ),김서영 ( Seo Young Kim ) 한국품질경영학회 2012 품질경영학회지 Vol.40 No.4
Purpose: The purpose of this study was to propose useful suggestions by analyzing causal effect relationship between port service quality and customer satisfaction and performance in port industry. Methods: The collected data through the survey were analyzed using multi?regression analysis. The measurement tools used for this study were divided into three dimensions such as internal quality interaction quality and environmental quality. Results: The results of this study are as follows; regarding the influence of pot service quality dimension on customer satisfaction it was found that the effects of interaction quality and internal quality were significant and those of environmental quality was not significant on customer satisfaction. It was found that customer satisfaction made statistically significant influence on performance from the investigation of the causal effect relationship between customer satisfaction and performance. Conclusion: Incheon Port needs to act actively paying attention to port facilities efficient operation network cargo recruitment activities smooth communication and fast handling.
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제3차(第3次) 해양법회의(海洋法會議)와 해양국제법(海洋國際法)의 신동향(新動向)
김수만 ( Schu Man Kim ) 국방대학교 안보문제연구소 1976 국방연구 Vol.19 No.1
The First U.N. Conference on the Law of the Sea in 1938 Concluded four multilateral conventions dealing with (a) Territorial Sea and the Contiguous Zone; (b) High Sea; (c) Continental Shelf; (d) Fishing and Conservation of the Living Resources of the High Sea. This Conference, as well as the second one in 1960, failed to reach agreement on the breadth of the territorial sea, the precise outer boundary of the continental Shelf, and many other issues. As a result of three major developments during past 15 years, namley growing tendency by many countries to extend unilaterally their claims over 200 nautical miles from the shore. The problem has increased international relation over the degradation of the marine environment, and mankind`s increasing ability to exploit both living and mineral resources of the oceans and seabeds. Before the third U.N. Conference on the Law of the Sea, the groundwork for the Conference was laid at a series of six preparatory meetings from 1971 to 1973 of the U.N. Committee on the Peaceful Uses of the Seabed and Ocean Floor Beyond the Limits of National Jurisdiction, so called the U.N. Seabed Committee. The third U.N. Conference on the Law of the Sea began in New York City with the first session December 3-14, 1973. The second, substantive conference session took place in Caracas, June 20-August 29, 1974, the third session in Geneva, March 17-May 9, 1975, and the fourth session is taken place twice in New York City, March 15 this year and is going on yet. Just as we have mentioned above, the groundwork of the conference was prepared for three years by the U.N. Seabed Committee and it`s sessions have been hold several times for a long time, but in spite of all these efforts, have not yet reached any agreement to adopt an international convention dealing with all matters relating to the law of the sea. Now, we need to know the reasons that an agreement has not reached yet. Indeed, Seeking of each national interests is the real obstacle to achieve an agreement. The national interests on the law of Sea involve the economical resources and military interests. The former is living and mineral resources, the latter is free transit or unimpeded transit of the warship and submarine through and overs traits used for international navigation. On the transit of the warship and submarine in. international straits, on group of States insists free transit of the Warship and submarine, and the another claims innocent passage. In my paper, I have studied principally the results of agreement on the living and mineral resources of the sea and two the opposit groups, insisting of free transit and maintaining innocent passage in the international straits among the representatives of all nations.
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